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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20a88f0714627707935100e0b51fc41ce5b8c087f7d0eb0eb90094c78e59d6fa' 
  AND token = 'd70RGAwpq5Xea0ycvIcZVfon0R6NXRe5Qzkhxlk0cXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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