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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99cbc73c9b870e9cd4f862fc6de3ea6a2d2907dd24aec761669f57b9fa6a0bb7' 
  AND token = 'WZZII1YzdLcK40+uEthrpLbeL8oeg/2geOy77LHW2TA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}