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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed143542a7472dd2e54d11d25cde7f588f8aadcad2265cc45e1aa907618e4a69' 
  AND token = 'potStLN+qEcsbGHdXgaevCEX9JAs1XZ0QSyi/gfKufI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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