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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fda707c99f26bfdd73aa5ed9c4461a192b1d9cf3d3f44d3178da22aa7a308d25' 
  AND token = 'eB3Zij1IOWcbVrvpKMOU8sul6uqiW8t9/Scfofe4JjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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