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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe48214d06f94e005cc3c2f11fc18dd12cdf7789660ee7dfa434ae385c1f32e8' 
  AND token = 'N6wCvphaxlabIrS3szDobpU+5WvzKRsKzfctsPF7KAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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