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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1c01eee4e6463f41bc808fc859d5967f95f3f6696577cb8194cd7792c540863' 
  AND token = '98Ps9OSsT/TEX2S7N8QNVGPj5ISKsuUmPKMZe94V6UY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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