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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81bcc743de0562cd83fabe9214a2419c999de2ce80c355563d3ee4cb36244368' 
  AND token = 'zx4oqob37rpvzXlnumZWy5O4ushHS6rl1rel5yuSbVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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