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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c26c33751ba071ecc1e7c4cffe6e6f8d3e0f5c392d090c9755545890de044ab' 
  AND token = 'jJo5QwYsRQhwXoQKAOtGmTl6trUkFwelFa5mIylWSnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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