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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f3e0bc583400ebda8ea0f51d6e50b579c8dcd23457b602b442a7febfa381e3a' 
  AND token = 'w0q7kyiy6w24GrSVVIc/KaZj3E5PuJnioMxLracnTUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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