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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fee19fd7de8ba7f9bcf1fac6e73ab342933f33c955e15c6adf3ac1695cd4217' 
  AND token = 'CC2/kJ2h+kTuTnrcW5xOfzdLh3G6+GLPkLpByZPunv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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