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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7048edebbf622be03341daa078fd509b4421dade6f914a471001f50cf3874bf6' 
  AND token = 'Hdv5tlkgstdZ2zsaIHsEg7oT7I+R9b0MBNUAsBri6uQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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