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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01020ee67f2b31747f553cfced706257a0d90308e6477c8b5974123549885204' 
  AND token = 'JNMSotrYdBMIE4MBDIBo4paNaP9AgNRAK/6fwoISUns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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