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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89e6c1ea1286b29577442a81d2206062997a9c6f72a2a801e18ba65e2ba6c937' 
  AND token = 'hckAJNPMQCQRKhUTGHFRsy0wvhK0/nnKBRhAM22RK/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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