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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dc64f64701a23e53f9bc4b9e079dbb0613c7c715a75c9a7edae58ceb0a7e38c' 
  AND token = 'C06zn84ife4j9k5sjSsHpkzznfvJOHc1sRDFPU6rwtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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