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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50f51f70e302c2b0c9a6d86b5ce350a67acc8be3ce5ac66bae6a8ebcfa4353aa' 
  AND token = '+J3Wh9kta5cS4xjyZ62H1uK/oRkkx+UXI/7HC5LymeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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