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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe7e2b1b028372bd9d2d60ec67c1d259a803c41027ca1c4e6220a7381ff03e8e' 
  AND token = '9wA0WdrXp1ofqAILdtnx+UoqxBimGAiOagv2Dg8FnFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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