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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a12d857170e02afb0df068b293a41fc713d09f242a20daafe4233c83f2de062' 
  AND token = 'fudkVjAxbhkp2MnwXGMfU64A65JZECyN87R/V6OueTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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