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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd14e5627d2bb159389dc74b064c742ec23ea1584fe2f2a8954557c9e0102efde' 
  AND token = 'pyzKxgn/zsyS5pB7EQ6DKPrt1huQ48clVWu5MFWNelY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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