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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b2cba0c5cb57034e3f79f0ebd0753dc69923541e25d98fd850045bb2661c898' 
  AND token = '9rqyWEWAnUh04JfZ2gaKdLjYmVN4o6Q4DXyJLuUHCrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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