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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '693e349956a8c7441f017b98ed2e7ef539f05f18a943ec9e74372aed992f755b' 
  AND token = 'equc49W1WFLQdQPQUWTP9eTj7VdciaJZ+i+6fL7CAv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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