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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '831ac670877cd4d4f226c67574843ba36884cd14b8e7f9b0f28501eb9d1ab210' 
  AND token = '8VFvaDdWykXe/M0xpX74L6PREh8JJ3CvvX2SW0c6px0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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