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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afa540b0e841bf0b5db78184ad8dc17574978205abe60ace98c04f5bc2f5208a' 
  AND token = 'wGM2x3n0JyFErU7Jh71NBzpOQNjamV+LPTSHQevV390=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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