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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e62ebdef03a78bead7e352e368156eb6679d5ec655666a3cffaf38448ba9e62' 
  AND token = 'Avc8b4LJOj60xbJMOwUUPGJm/k684tNkJ3WvdAGXZMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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