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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83443086a3f8f8ad4fe699c53dc34aa3823842d86d68b7817692f04922f5e9cd' 
  AND token = '9jXR9FjtHoDVeZozBC6Qbp1klzLSZAk0Es/jKjBbHNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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