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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd70eff70130552192731b416d4c960b835fcc03c01cd11ea17486d5950760db5' 
  AND token = 'OImy1RTmgS+cVTn74hKnTU6h/Xia627vSc2b27xxy1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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