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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc2b2f5b87996a9c3e48cd8256162b4ed413d781c30a7296e35fd151f45a5d4c' 
  AND token = 'vMaCPjm1axwPVIHmFMtUnyoRqdjAl8axXfxMd7pFimc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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