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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28be2014e432cd6abff4a9c9a33bde25a98657d87e2ff70a9d4b756ecdd4caa9' 
  AND token = 'g1A65iP+Ap8A6IgiqZwMTANWAhiEWvOF25nLRUxTJ2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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