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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a79701eeabd7f81f8ac1e1477d8019b78235fd695c642123748d64a8c2c0036e' 
  AND token = '2CxJe1U+cIRDYhccbgDUqrZJ59dPtFc/hq4apG42/Ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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