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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e48ec3c2482e7503ce2cdd473a39cc5ea893d02542ecd62ce6329f218827f6a9' 
  AND token = '4iDAJPEytqstpmYCHj4LDl5UBFrgFh4jNeU7TWLS4P0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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