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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa049495a6ffe5b0d22506562a6d0cec07e49acb6e5f0aca30610f651e870d13' 
  AND token = '8gc1gVeM7iwDySI+r6Zc9gHIAu89RFvMlT7sDGy+Hx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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