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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2712f1987f1e3fa5d9cb9f8a41b84bdac9d401381ca404a0f45f0764aef9a600' 
  AND token = '7J33gXYsstb5klhp5gm0/mqUS7ebMAIy21eNyVGzSg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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