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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58910471f4b267d41ba7bf9b84e23c75d01d2508c65e3b54149fdb7706dd2fae' 
  AND token = 'rEDh8jtePxx+rvfnVH0B6N6/at89HPDtt3m7AwqSYXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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