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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e13aca0e6f84169fd22f9a0e96c1d6f8a534b188db4a45ee0397324704d6742e' 
  AND token = 'OBmMbtnXHYzG8axyEZNo79/ASf4pG/O8E0O6DZlG4uA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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