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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ce6dafd335bafc274789ba2801307697cd184c08f85a3a27b3960c16a5b6001' 
  AND token = 'j2etGFaUr+GS6beM5KQPvbc2VXbjA/H4h8NZ+7rdv9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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