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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3d47fb6166de098dd4aff277d865a4401bab476a30bd806cc94359cc39dca49' 
  AND token = 'mDe/q8s/zagmn1Kn3OPIuS1M2gpa+JiWzKYekNdFg6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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