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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b240ed4d5e6a7e9e1de2528aca174e7ce615c1ee2b886ac7a1006dd58b5d7fed' 
  AND token = 'Z4TQAIRW+sQ7cxAGaQk/T3t5TYGlAMd4+fsr9VugfdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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