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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77f03103a1fa0f17c8cb27c0bf8d44d97f20846ca71ea6ce6186c742dc9e3631' 
  AND token = 'v6LKjaPoAUIC50Y0PWKuhzHv4R3d5SKO+W6hSdnjFE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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