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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e1b7d9fa3ace3ad1f831355fc26a22938b2fe55b0d8281d069b6782cf776bd6' 
  AND token = 's44OCQUgKPSSxLXktWCkFX0g0VX4+pFa+G6mZs1k0xI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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