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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d1dc5c06f986be10e25d78b99cd18879cfd6c7ed104314987e411de654aa669' 
  AND token = 'NvtKnHwortDkr9J7F6kDXmIv65ql4CrdEFptMT+/m8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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