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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c90f5b7062b004f3613ab295ea102b1bc9c0620feae85dd05257a2bbd3d6a9be' 
  AND token = 'OM4ytxk6bU159qro18Zie3fv3dge3mxqLJElvcdVef8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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