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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0472b59be6e5880f1d943f48b640a02c791c3a6262f0ff3da625f56beca48b77' 
  AND token = 'KxmXSkuhUE3PuXxURpB69DfKg4iupoT/rWIs/egWkCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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