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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9d47e27891c52c4d1cfd4f1312d812117151fc41b58d4b9075e1a4221cf68c0' 
  AND token = 'rpshNyyWUD/CkX5JF/x8HTrcmE+VBonYB5UF1R+XvrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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