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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eef120c0c2d599563d806b97aba6c086d2cca276aaba49ddb6b8bab01bc7e1a0' 
  AND token = 'Nw757z3+lfXOLNiufszkdmI43Awqibkb0Y3p/LJPGbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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