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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e37b2083e3615f01788279029581a8b33a5f02981a1e35f3271763068aad5194' 
  AND token = 'bgGhAUQs/u3CsodMY7BCEGQXf/QQEN/OpQ90Xs/QbMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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