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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8535cbef149e259647bfd121e4fa7810e9c6013dc132500d8d41a39eb6264e5a' 
  AND token = 'AdZA1NujI3hJ3nB4N1zK88L6hPLKF686n56CQVOtGHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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