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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0a2377b9cdbaaba61a1feba2c551c0d4e8f823b466096296e944ac1028c297c' 
  AND token = 'TKmxSluWJ5kywlr5aGc0vxsWnKWqWLPL4ShWF+Vmg24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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