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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5f5d8ca86d5d9cd252790f0537844839a14f59c44af41dbcec95ae22914e4fd' 
  AND token = 'HVNTVN0qwxZ9hWc8hvFHByNtk2QPIR9DPvhiCaHBBJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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