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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a009c7bd9b1c1a7edd925f3cfdce5299357afa57e877dfee3d7cf2464002ae6f' 
  AND token = 'azW9DEBPHIVVlvmn9p325cJzk8LnCHOD4BArlZMkIRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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