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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9bae8fdad107942bcb88ff5883e1c987df3b05957d353dba0b941b3a5f5db43' 
  AND token = 'YJhJKP0+gazq5boQifRoYsanQxu/zC//h+JkXeXgo1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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