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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f465fa5d1ca8ebfa1e4e1ce056fa63b4f0fcc26e5a0449b9f462cb2345627cc' 
  AND token = 'dhqV5uOXI5xP18qIBOBFbhfJgngl+QBGsxcGOInOq5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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