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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bcdaab551b661128441ced03c4a654f8309d38358f0b55486489ac3fd375943' 
  AND token = 'Vk7xy5KqQp6XlYKqBhdTBon83JaG1VrBdzyc8ahep/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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