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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '401636b050b91e4b408e65564f4d3235122b6957fe896df8da74d0315e8ef947' 
  AND token = 'JawczTgq92NUhHTTSXDmpE/4CRpy4tsX5bh/Mn6G1dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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