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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b3f8c87af22376bf4ae218234fe9131ef51b053a24a2aa7bde25eafe8ca9e0d' 
  AND token = '2+5+KTzDB8Rp1SRJBhtQ6rrsSE7Zh1fQI348bSqCF10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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