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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f684bfd6ed5a500c58ce94457affb1dfff44f33bf4ab26b7ca7c0ffbfa3cdfe' 
  AND token = 'tjsQ0eyfuB1RE6AlxQ2oE/UEg7GCi3RREv2mcpn1UGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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