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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa1193f17c15e956f391e786fa0c7c5b81c70569593f37fefb3f379d090b2a9a' 
  AND token = '2bSw6nFI5ECRr0Tlcz5jHjx/p0+9ieBVRxYrOy80Zdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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