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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc6dd31d6b61f4779d876ce3c7e7b327b875fa529ef6f4843decda807a2eeb5f' 
  AND token = 'Sva5guEK4b4vbIRPwqSmMDk9WHQqd+HVIRF0u7QLGpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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