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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57a6b90aafe40678f011eddcaa0e9e8307454ce600bb409977361f759b020de7' 
  AND token = 'kzZT2sXi4SkEBkqnoQ28XpE0/GtZ1t17NHIEW9xBVDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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